var speed=200;
//图片滚动速度

//获取需要处理的DOW元素
var scroll_begin=document.getElementById("scroll_begin");
var scroll_end=document.getElementById("scroll_end");
var scroll_box=document.getElementById("scroll_box");

//复制图片元素
scroll_end.innerHTML=scroll_begin.innerHTML;

//设置滚动区域
scroll_box.scrollLeft=0;

function marquee() {
    if (scroll_box.scrollLeft>=scroll_end.offsetWidth){
        scroll_box.scrollLeft-=scroll_begin.offsetWidth;
    }else {
        scroll_box.scrollLeft++;
    }
}

//定时滚动
setInterval(marquee,speed);
